18691350433 has 16 divisors (see below), whose sum is σ = 21527009280. Its totient is φ = 15897186000.

The previous prime is 18691350409. The next prime is 18691350443. The reversal of 18691350433 is 33405319681.

It is a cyclic number.

It is not a de Polignac number, because 18691350433 - 2⁵ = 18691350401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18691350433.

It is not an unprimeable number, because it can be changed into a prime (18691350443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2283438 + ... + 2291608.

It is an arithmetic number, because the mean of its divisors is an integer number (1345438080).

Almost surely, 2^18691350433 is an apocalyptic number.

It is an amenable number.

18691350433 is a deficient number, since it is larger than the sum of its proper divisors (2835658847).

18691350433 is a wasteful number, since it uses less digits than its factorization.

18691350433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10668.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 18691350433 in words is "eighteen billion, six hundred ninety-one million, three hundred fifty thousand, four hundred thirty-three".